Add a content API for postMessage

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 64b1d582eca608e3d74a9dcea2fbc615e6fcaa91..f32e4837f8f883adf9257f263cbe6d6f0eef6967 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1329,6 +1329,15 @@ public class ContentViewCore
     }
 
     /**
+     * Post a message to the main frame.
+     * TODO(sgurun) also add support for transferring a message channel port
+     */
+    public void postMessageToMainWindow(String message, String targetOrigin) {
+        if (mNativeContentViewCore == 0) return;
+        nativePostMessageToMainWindow(mNativeContentViewCore, message, targetOrigin);
+    }
+
+    /**
      * To be called when the ContentView is shown.
      */
     public void onShow() {